Developing box and processing box

Abstract

According to the developing box and the processing box provided by the utility model, the developing box comprises the driving force receiving piece, the transmission assembly and the rotatably arranged developing roller, the driving force receiving piece is used for receiving the driving force to drive the developing roller to rotate around the rotating axis parallel to the left-right direction, and along the left-right direction, the driving end provided with the driving force receiving piece is the left end, and the driving end provided with the transmission assembly is the right end; a non-driving end opposite to the driving end is a right end; the transmission assembly at least comprises a third gear and a fourth gear, the third gear comprises a first transmission part and a third-stage gear which are coaxially arranged, the fourth gear comprises a first large gear and a first small gear which are coaxially arranged, the radial size of the first large gear is larger than that of the first small gear, and in the left-right direction, compared with the first large gear, the radial size of the first small gear is larger than that of the first small gear. The first pinion is farther from the non-driving end; the third-stage gear and the first transmission part are formed separately, and the third-stage gear is used for being meshed with the first large gear; therefore, the overall space layout of the transfer assembly and the developing box is more compact.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic photographic imaging, in particular to a developing box detachably installed in an electronic photographic imaging device and a processing box comprising the developing box. Background Art

[0002] The developing box can be installed to the imaging device in a detachable manner. The developing box includes a driving force receiving member, a developing shell, and a developing roller and a powder feeding roller installed in the developing shell. The driving force receiving member is used to receive driving force from the imaging device to drive the developing roller and the powder feeding roller to rotate.

[0003] The developing box also includes a driving force transmission component, which includes at least a driving gear, an intermediate gear and a stirring gear. The driving gear is coaxially arranged with the driving force receiving member, and the intermediate gear includes a first-stage gear and a second-stage gear which are coaxially arranged. The first-stage gear is used to engage with the driving gear to receive the driving force, and the second-stage gear is used to engage with the stirring gear to transmit the driving force to the stirring gear; in a direction parallel to the axial direction of the developing roller, the second-stage gear is closer to the developing housing than the first-stage gear, and the radial dimension of the first-stage gear is larger than the radial dimension of the second-stage gear. The spatial layout of the transmission component arranged in this way is not compact enough, the intermediate gear is easy to fall off the developing housing, and the driving force cannot be transmitted stably. Utility Model Content

[0004] The developer cartridge and the processing cartridge provided by the present invention can solve at least one of the above technical problems. The specific technical solutions are as follows:

[0005] The developing box is detachably mounted to the imaging device and includes a driving force receiving member, a developing shell and a developing roller rotatably arranged in the developing shell. The developing shell is used to accommodate the developer. The driving force receiving member is used to receive the driving force from the imaging device to drive the developing roller to rotate around a rotation axis parallel to the left and right directions. Along the left and right directions, the driving end where the driving force receiving member is provided is the left end, and the non-driving end opposite to the driving end is the right end.

[0006] The developing box also includes a transmission component for receiving and transmitting driving force, the transmission component includes at least a third gear and a fourth gear, the third gear is coaxially arranged with the driving force receiving member, the third gear includes a first transmission part and a third-stage gear arranged from left to right and coaxially arranged, the first transmission part is used to receive the driving force from the driving force receiving member and transmit the driving force to at least the developing roller.

[0007] The fourth gear includes a first large gear and a first small gear arranged coaxially, the radial dimension of the first large gear is larger than the radial dimension of the first small gear, and, in the left and right directions, the first small gear is farther away from the non-driving end than the first large gear; the third-stage gear is formed separately from the first transmission part and is used to engage with the first large gear.

[0008] The developing box also includes a bracket located at the driving end, which is mounted on the developing housing, and is used to support at least one of the developing roller and the powder feeding roller; the developing housing is also provided with a supporting portion for simultaneously supporting the third gear and the driving force receiving member, and the supporting portion protrudes from the developing housing toward the direction away from the non-driving end.

[0009] The driving force receiving member has a first surface located at the outermost side in the radial direction, and a projection of the first surface is located within a projection range of the support portion when viewed in the left-right direction.

[0010] The driving force receiving member is provided with an assembly portion on the radial inner side, the assembly portion has an inner surface for cooperating with the support portion, and the driving force receiving member also has a first surface located at the radial outermost side. When viewed in the left and right directions, the projection of the first surface is located within the projection range of the inner surface of the assembly portion.

[0011] At least one force transmitting portion is provided on the first transmitting portion, and at least one force receiving portion is provided on the third stage gear. The driving force is transmitted to the third stage gear through the mutual cooperation between the force transmitting portion and the force receiving portion.

[0012] The direction intersecting with the left and right directions is the front-to-back direction. The developing box also includes a stirring member for stirring the developer. In the front-to-back direction, the developing roller is located in front of the stirring member. The stirring member includes a stirring roller shaft and a stirring blade installed on the stirring roller shaft. The stirring roller shaft drives the stirring blade to rotate. The left and right ends of the stirring roller shaft pass through the developing housing and are supported by the developing housing respectively; the transmission assembly also includes a fifth gear and a transition portion. The transition portion is used to transmit the driving force from the fourth gear to the fifth gear. The transition portion can engage with the first small gear and the fifth gear at the same time. In the left and right directions, the fifth gear is located on the left side of the first large gear. When viewed from left to right, the fifth gear partially overlaps with the first large gear.

[0013] The transition portion includes a sixth gear and at least one seventh gear. The sixth gear is used to mesh with the first pinion gear, and the seventh gear is used to mesh with the sixth gear and the fifth gear at the same time.

[0014] The developing box also includes a powder feeding roller for conveying the developer to the developing roller, the developing roller includes a developing roller layer and a developing roller shaft, and the developing roller shaft protrudes from the left and right ends of the developing roller layer; the powder feeding roller includes a powder feeding roller layer and a powder feeding roller shaft, and the powder feeding roller shaft protrudes from the left and right ends of the powder feeding roller layer; the first transmission part includes a first-stage gear and a second-stage gear arranged coaxially, the first-stage gear is used to transmit the driving force to the developing roller, and the second-stage gear is used to transmit the driving force to the powder feeding roller; the transmission assembly also includes a first gear and a second gear, the first gear is used to engage with the second-stage gear, and the second gear is used to engage with the first-stage gear.

[0015] The radial dimension of the second-stage gear is larger than that of the third-stage gear. In the left-right direction, a portion of the first large gear is covered by the second-stage gear.

[0016] The processing cartridge includes a drum cartridge and the above-mentioned developing cartridge, the drum cartridge includes a drum casing and a photosensitive drum rotatably arranged in the drum casing, the developing cartridge can be accommodated by the drum casing, the surface of the photosensitive drum is used to form an electrostatic latent image, and the developing roller is used to supply the developer to the surface of the photosensitive drum so that the electrostatic latent image is developed.

[0017] Compared with the prior art, the developing box provided by the present invention, on the one hand, the fourth gear of the transmission assembly includes a first large gear and a first small gear arranged coaxially, the first large gear is used to engage with the third-stage gear to transmit driving force, and the radial dimension of the first large gear is larger than the radial dimension of the first small gear. Such an arrangement makes the overall spatial layout of the transmission assembly and the developing box more compact.

[0018] On the other hand, in the left and right directions, the third-stage gear is closer to the non-driven end than the first-stage gear and the second-stage gear, and the first large gear is closer to the non-driven end than the first small gear. In this way, when the first large gear and the third-stage gear are engaged with each other, the rotational stability of the first large gear and the third-stage gear is enhanced, and the driving force can be transmitted more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A It is a three-dimensional diagram of the developing box involved in the present utility model.

[0020] Figure 1B The utility model relates to a developing box edge Figure 1A The plan view after cutting along the BB direction.

[0021] Figure 2 This is a three-dimensional diagram of the developing box involved in the utility model with the driving end cover hidden.

[0022] Figure 3 This is an exploded view of some components of the driving end of the developing cartridge involved in the present invention.

[0023] Figure 4 It is a partial three-dimensional view of the developing shell of the developing box involved in the present invention.

[0024] Figure 5 This is a plan view of the developer cartridge of the present invention after the drive end cover is hidden, as viewed from left to right.

[0025] Figure 6 The utility model relates to a developing box which hides the driving end cover and Figure 5 The plan view after cutting along the AA direction.

[0026] Figure 7 It is a three-dimensional diagram of the transmission component of the developing box involved in the present invention.

[0027] Figure 8 This is an exploded view of the transmission component of the developing box involved in the utility model.

[0028] Figure 9 It is a plan view of the transfer assembly of the developing box involved in the present invention observed from left to right.

[0029] Figure 10 This is a plan view of the transfer assembly of the developer cartridge of the present invention viewed from above.

[0030] Figure 11 It is a stereoscopic diagram of the driving force receiving member involved in the present invention after being connected with the first-stage gear and the second-stage gear in the transmission assembly. DETAILED DESCRIPTION

[0031] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0032] [Developer cartridge]

[0033] The developing cartridge 100 can be detachably mounted to an image forming apparatus, such as Figure 1A and Figure 1B As shown, the developing box 100 includes a developing housing 10 and a developing roller 20 and a powder feeding roller 30 rotatably arranged in the developing housing 10, the developing roller 20 rotates around a first rotation axis L1, and the powder feeding roller 30 rotates around a second rotation axis parallel to the first rotation axis L1. The direction parallel to the first rotation axis L1 is the left-right direction, and the direction intersecting with the left-right direction is the front-back direction. At least a portion of the developing roller 20 is located in front of the powder feeding roller 30, and the direction intersecting with both the left-right direction and the front-back direction is the up-down direction.

[0034] The developing cartridge 100 further includes a driving force receiving member 40 for receiving driving force from the image forming apparatus. In the left-right direction, the developing cartridge 100 is provided with the driving force receiving member 40 having one end as a driving end and the other end as a conductive end (non-driving end).

[0035] like Figure 1B 、 Figure 2 and Figure 3 As shown, the developing roller 20 includes a developing roller layer 21 and a developing roller shaft 22, and the developing roller shaft 22 protrudes from the left and right ends of the developing roller layer 21; the powder feeding roller 30 includes a powder feeding roller layer 31 and a powder feeding roller shaft 32, and the powder feeding roller shaft 32 protrudes from the left and right ends of the powder feeding roller layer 31.

[0036] The developing box 100 also includes a bracket 50 located at the driving end, which is installed on the developing shell 10. The bracket 50 is used to support at least one of the developing roller 20 and the powder feeding roller 30. Specifically, in the left and right directions, the developing roller shaft 22 and the powder feeding roller shaft 32 can both pass through the bracket 50 to the left.

[0037] like Figure 4 As shown, the developing box 100 also includes a stirring member 80 for stirring the developer and is arranged in the developing housing 10. In the front-to-back direction, the developing roller 20 / powder feeding roller 30 is located in front of the stirring member 80. The stirring member 80 includes a stirring roller shaft 81 and a stirring blade 82 installed on the stirring roller shaft 81. The stirring blade 82 is used to stir the developer and transport the developer toward the powder feeding roller 30. The stirring roller shaft 81 drives the stirring blade 82 to rotate. The left and right ends of the stirring roller shaft 81 respectively pass through the developing housing 10 and are supported by the developing housing 10.

[0038] (Drive end of the developer cartridge)

[0039] like Figure 1A and Figure 2 As shown, at the driving end, the developer cartridge 100 is further provided with a transmission assembly 60 and a driving end cover 70. The driving end cover 70 is detachably connected to the developer housing 10. The transmission assembly 60 is used to receive and transmit the driving force from the driving force receiving member 40. At least a portion of the transmission assembly 60 is covered by the driving end cover 70. The transmission assembly 60 includes at least a first gear 61, a second gear 62, a third gear 63, a fourth gear 64 and a fifth gear 65. Figure 3 and Figure 4 As shown, the third gear 63 is coaxially arranged with the driving force receiving member 40, and the third gear 63 receives the driving force from the driving force receiving member 40 and transmits the driving force to other gears; the developing housing 10 is also provided with a support portion 11 for simultaneously supporting the third gear 63 and the driving force receiving member 40, and the support portion 15 is formed by protruding from the developing housing 10 in a direction away from the non-driving end, and the support portion 11 is not connected to the bracket 50; in the process of the driving force receiving member 40 transmitting the driving force, the vibration of the driving force receiving member 40 will cause the support portion 11 to vibrate, and the support portion 11 is not connected to the bracket 50, so that the vibration of the support portion 11 can be avoided from affecting the developing roller 20 and the powder feeding roller 30.

[0040] like Figure 5 、 Figure 6 and Figure 7 As shown, the driving force receiving member 40 is provided with an assembly portion 42 on the radial inner side for cooperating with the support portion 11. Through the mutual cooperation between the support portion 11 and the inner surface 421 of the assembly portion 42, the driving force receiving member 40 can be supported by the developing housing 10; the driving force receiving member 40 also has a first surface 41 located at the radial outermost side. When viewed in the left and right directions, the projection of the first surface 41 is located within the projection range of the inner surface 421 of the assembly portion 42; in addition, when viewed in the left and right directions, the projection of the first surface 41 is also located within the projection range of the support portion 11. In this way, the driving force receiving member 40 can be stably supported by the support portion 11, and thus be stably supported in the developing housing 10. When the developing box 100 is installed to the imaging device and the driving force receiving member 40 is used to receive the driving force, the driving force can be more stably transmitted from the driving head of the imaging device to the driving force receiving member 40.

[0041] like Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown, the third gear 63 includes a first transmission part and a third-stage gear 633 which are arranged from left to right and are coaxially arranged. The first transmission part is used to receive the driving force from the driving force receiving member 40 and transmit the driving force to at least the developing roller 20; preferably, the first transmission part includes a first-stage gear 631 and a second-stage gear 632 which are coaxially arranged. The first-stage gear 631, the second-stage gear 632 and the third-stage gear 633 are arranged from left to right in sequence. Compared with the third-stage gear 633, the first-stage gear 631 is closer to the driving force receiving member 40, and the third-stage gear 633 is closer to the first transmission part. The transmission part / second-stage gear 632 is formed separately, and the first-stage gear 631 and the second-stage gear 632 can be formed integrally or separately; generally, the first transmission part and the driving force receiving member 40 are formed integrally, and therefore, in the whole formed by the first transmission part, the driving force receiving member 40 and the third-stage gear 633, the first transmission part and the driving force receiving member 40 can be regarded as replaceable parts, and the replaceable parts are formed separately from the third-stage gear 633, so that different replaceable parts can be selected according to the specific needs of the developing box 100, so that the scope of application of the developing box 100 is expanded.

[0042] like Figure 8 and Figure 11 As shown, at least one force transmission part 634 is provided on the first transmission part / second stage gear 632, and at least one force receiving part 635 is provided on the third stage gear 633. Through the mutual cooperation between the force transmission part 634 and the force receiving part 635, the driving force can be transmitted from the second stage gear 632 to the third stage gear 633.

[0043] Continue as Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown, the first gear 61 is mounted on the developing roller shaft 22 and is used to engage with the second-stage gear 632, so that the driving force can be transmitted to the developing roller 20; the second gear 62 is mounted on the powder feeding roller shaft 32 and is used to engage with the first-stage gear 631, so that the driving force can be transmitted to the powder feeding roller 30; in this way, during the transmission of the driving force, the paths of the driving force transmitted to the developing roller 20 and the driving force transmitted to the powder feeding roller 30 are different, and the two driving force transmission paths will not interfere with each other, which is conducive to more stable transmission of the driving force to the developing roller 20 and the powder feeding roller 30.

[0044] The fourth gear 64 is used to mesh with the third-stage gear 633, so that the driving force is transmitted to the fourth gear 64. Specifically, the fourth gear 64 includes a first large gear 641 and a first small gear 642 arranged in the left-right direction and coaxially arranged. The first large gear 641 is located on the right side of the first small gear 642. The first large gear 641 is used to mesh with the third-stage gear 633 to transmit the driving force. The radial dimension of the first large gear 641 is larger than the radial dimension of the first small gear 642. This can make the overall spatial layout of the transmission assembly 60 and the developer box 100 more compact. At the same time, in the left-right direction, compared with the first-stage gear 631 and the second-stage gear 632, the third-stage gear 633 is closer to the non-driving end, and compared with the first small gear 642, the first large gear 641 is closer to the non-driving end. In this way, when the first large gear 641 and the third-stage gear 633 mesh with each other, the rotational stability of the first large gear 641 and the third-stage gear 633 is enhanced, and the driving force can be transmitted more smoothly.

[0045] In the fourth gear 64, the first large gear 641 is used to receive driving force, and the first small gear 642 is used to transmit driving force. According to the above description, compared with the first small gear 642, the first large gear 641 is closer to the non-driving end. At the same time, the radial dimension of the first large gear 641 is larger than the radial dimension of the first small gear 642. Compared with the driving force transmitted outward by the first large gear 641 and the driving force transmitted outward by the first small gear 642, the fourth gear 64 can drive a larger load.

[0046] In some embodiments, the radial dimension of the second-stage gear 632 is greater than the radial dimension of the third-stage gear 633. Along the left-right direction, a portion of the first large gear 641 is covered by the second-stage gear 632. Such an arrangement can better prevent the third-stage gear 633 and the fourth gear 64 / the first large gear 64 from falling off.

[0047] The fifth gear 65 is installed at the left end portion of the stirring roller shaft 81. In some embodiments, the driving force received by the fifth gear 65 is used to drive the stirring member 80 to rotate; in some embodiments, the fifth gear 65 can also cooperate with the counted part in the imaging device, so that the imaging device can count the developing box 100.

[0048] The transmission assembly 60 also includes a transition portion for transmitting the driving force from the fourth gear 64 to the fifth gear 65, and the transition portion includes a sixth gear 66 and at least one seventh gear 67. The seventh gear 67 is engaged with the sixth gear 66 and the fifth gear 65 at the same time. The sixth gear 66 is used to engage with the first pinion 642, so that the driving force can be transmitted to the sixth gear 66, and the driving force can be transmitted to the fifth gear 65 through the seventh gear 67; in this embodiment, the seventh gear 67 is also used to adjust the rotation direction of the fifth gear 65, so the number of gears in the transition portion can be set according to the rotation direction of the fifth gear 65.

[0049] The developing box 100 also includes a supporting shaft for supporting the sixth gear 66 and the seventh gear 67. In some embodiments, the supporting shaft is arranged on the driving end cover 70, which can simplify the structure of the developing housing 10. At the same time, the assembly steps of the developing box 100 can also be simplified.

[0050] In some embodiments, in the left-right direction, the fifth gear 65 is located on the left side of the first large gear 641. When viewed from left to right, the fifth gear 65 partially overlaps with the fourth-stage gear 64. When the developing box 100 is installed on the imaging device, such an arrangement can prevent the fourth gear 64 from falling off from the developing housing 10 due to vibration caused by the transmission of driving force.

[0051] [Processing cartridge]

[0052] The developing box 100 provided by the present invention is also suitable for a processing box, which can be detachably installed to an electronic photographic imaging device. The processing box includes a developing box 100 and a drum box that are combined with each other. The drum box includes a drum shell and a photosensitive drum rotatably arranged in the drum shell, and an electrostatic latent image can be formed on the surface of the photosensitive drum.

[0053] [Beneficial Effects]

[0054] Compared with the prior art, the developer cartridge 100 and the process cartridge including the developer cartridge 100 provided by the present invention have the following beneficial effects:

[0055] First, the transmission assembly 60 includes a fourth gear 64, and the fourth gear 64 includes a first large gear 641 and a first small gear 642 that are coaxially arranged. The first large gear 641 is used to engage with the third-stage gear 633 to transmit driving force. The radial dimension of the first large gear 641 is larger than the radial dimension of the first small gear 642. Such an arrangement makes the overall spatial layout of the transmission assembly 60 and the developing box 100 more compact.

[0056] Secondly, in the left and right directions, compared with the first-stage gear 631 and the second-stage gear 632, the third-stage gear 633 is closer to the non-driven end, and compared with the first small gear 642, the first large gear 641 is closer to the non-driven end. In this way, when the first large gear 641 and the third-stage gear 633 are engaged with each other, the rotational stability of the first large gear 641 and the third-stage gear 633 is enhanced, and the driving force can be transmitted more smoothly.

[0057] Thirdly, when viewed from left to right, the fifth gear 65 partially overlaps with the fourth-stage gear 64, and a portion of the first large gear 641 is covered by the second-stage gear 632. When the developer box 100 is installed on the imaging device, such an arrangement can prevent the fourth gear 64 from falling off from the developer housing 10 due to vibration caused by the transmission of the driving force.

[0058] Fourthly, the driving force receiving member 40 is provided with an assembly portion 42 on the radial inner side, and the inner surface 421 of the assembly portion 42 is used to cooperate with the support portion 11. The driving force receiving member 40 also has a first surface 41 located at the radial outermost side. When viewed in the left and right directions, the projection of the first surface 41 is located within the projection range of the inner surface 421 of the assembly portion 42. When the developing box 100 is installed to the imaging device and the driving force receiving member 40 is used to receive the driving force, such an arrangement can make the driving force more stably transmitted from the imaging device to the driving force receiving member 40.

[0059] Fifthly, the developing housing 10 is also provided with a support portion 11 for simultaneously supporting the third gear 63 and the driving force receiving member 40. The support portion 11 is not connected to the bracket 50. In the process of the driving force receiving member 40 transmitting the driving force, the vibration of the support portion 11 can be avoided from affecting the developing roller 20 and the powder feeding roller 30.

[0060] Sixthly, the stirring member 80 will generate vibration when stirring the developer, especially when the amount of developer is large, the vibration amplitude of the stirring member 80 is larger, and the vibration can be transmitted to at least the fourth gear 64 and the third gear 63 through the fifth gear 65. However, because the third-stage 633 gear and the second-stage gear 632 are formed separately, the vibration is not easily transmitted to the first-stage gear 631 and the second-stage gear 632, so that the vibration impact on the developing roller 20 and the powder feeding roller 30 can be reduced.

Claims

1. A developing cartridge, removably mounted to an imaging device, comprising a driving force receiving member, a developing housing, and a developing roller rotatably mounted in the developing housing, wherein the developing housing is configured to accommodate a developer, the driving force receiving member is configured to receive a driving force from the imaging device to drive the developing roller to rotate about a rotation axis parallel to a left-right direction, wherein a driving end where the driving force receiving member is disposed is a left end, and a non-driving end opposite to the driving end is a right end. It is characterized in that The developing cartridge further includes a transmission assembly for receiving and transmitting a driving force, the transmission assembly including at least a third gear and a fourth gear, the third gear being coaxially disposed with the driving force receiving member, the third gear including a first transmission portion and a third-stage gear arranged from left to right and coaxially disposed, the first transmission portion being configured to receive the driving force from the driving force receiving member and transmitting the driving force at least to the developing roller; The fourth gear includes a first large gear and a first small gear that are coaxially arranged, the radial dimension of the first large gear is larger than the radial dimension of the first small gear, and, in the left-right direction, the first small gear is farther from the non-driving end than the first large gear; The third-stage gear is formed separately from the first transmission portion and is used to mesh with the first large gear.

2. The developing cartridge according to claim 1, wherein The developing box also includes a bracket located at the driving end, which is mounted on the developing housing, and is used to support at least one of the developing roller and the powder feeding roller; the developing housing is also provided with a supporting portion for simultaneously supporting the third gear and the driving force receiving member, and the supporting portion protrudes from the developing housing toward the direction away from the non-driving end.

3. The developing cartridge according to claim 2, wherein: The driving force receiving member has a first surface located at the outermost side in the radial direction, and a projection of the first surface is located within a projection range of the support portion when viewed in the left-right direction.

4. The developing cartridge according to claim 2, wherein: The driving force receiving member is provided with an assembly portion on the radial inner side, the assembly portion has an inner surface for cooperating with the support portion, and the driving force receiving member also has a first surface located at the radial outermost side. When viewed in the left and right directions, the projection of the first surface is located within the projection range of the inner surface of the assembly portion.

5. The developing cartridge according to claim 1, wherein At least one force transmitting portion is provided on the first transmitting portion, and at least one force receiving portion is provided on the third stage gear. The driving force is transmitted to the third stage gear through the mutual cooperation between the force transmitting portion and the force receiving portion.

6. The developing cartridge according to claim 1, wherein: The direction intersecting the left-right direction is the front-to-back direction. The developing cartridge further includes a stirring member for stirring the developer. In the front-to-back direction, the developing roller is located in front of the stirring member. The stirring member includes a stirring roller shaft and a stirring blade mounted on the stirring roller shaft. The stirring roller shaft drives the stirring blade to rotate. The left and right ends of the stirring roller shaft respectively pass through the developing housing and are supported by the developing housing. The transmission assembly also includes a fifth gear and a transition portion, which is used to transmit the driving force from the fourth gear to the fifth gear. The transition portion can engage with the first small gear and the fifth gear at the same time. In the left and right directions, the fifth gear is located on the left side of the first large gear. When viewed from left to right, the fifth gear partially overlaps with the first large gear.

7. The developing cartridge according to claim 6, wherein: The transition portion includes a sixth gear and at least one seventh gear. The sixth gear is used to mesh with the first pinion gear, and the seventh gear is used to mesh with the sixth gear and the fifth gear at the same time.

8. The developing cartridge according to claim 1, wherein: The developing cartridge further includes a powder feeding roller for feeding the developer to the developing roller, wherein the developing roller includes a developing roller layer and a developing roller shaft, and the developing roller shaft protrudes from the left and right ends of the developing roller layer; the powder feeding roller includes a powder feeding roller layer and a powder feeding roller shaft, and the powder feeding roller shaft protrudes from the left and right ends of the powder feeding roller layer; The first transmission part includes a first-stage gear and a second-stage gear arranged coaxially, the first-stage gear is used to transmit the driving force to the developing roller, and the second-stage gear is used to transmit the driving force to the powder feeding roller; The transmission assembly further includes a first gear and a second gear, wherein the first gear is used to mesh with the second-stage gear, and the second gear is used to mesh with the first-stage gear.

9. The developing cartridge according to claim 8, wherein: The radial dimension of the second-stage gear is larger than that of the third-stage gear. In the left-right direction, a portion of the first large gear is covered by the second-stage gear.

10. A process cartridge, characterized in that The processing box includes a drum box and a developing box as described in any one of claims 1 to 9, the drum box includes a drum shell and a photosensitive drum rotatably arranged in the drum shell, the developing box can be accommodated by the drum shell, the surface of the photosensitive drum is used to form an electrostatic latent image, and the developing roller is used to supply developer to the surface of the photosensitive drum to develop the electrostatic latent image.

Images